688984 has 16 divisors (see below), whose sum is σ = 1311120. Its totient is φ = 339360.

The previous prime is 688979. The next prime is 688999. The reversal of 688984 is 489886.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 688984.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39 + ... + 1174.

It is an arithmetic number, because the mean of its divisors is an integer number (81945).

2⁶⁸⁸⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

688984 is a deficient number, since it is larger than the sum of its proper divisors (622136).

688984 is a wasteful number, since it uses less digits than its factorization.

688984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290 (or 1286 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 688984 is about 830.0506008672. The cubic root of 688984 is about 88.3221662241.

The spelling of 688984 in words is "six hundred eighty-eight thousand, nine hundred eighty-four".